🎨 Palette: 스크린 리더 접근성 향상을 위한 한국어 ARIA 라벨 적용

[seonghobae]

💡 What (추가된 기능): 영어로 되어있던 ARIA 라벨('Directory listing')을 한국어('디렉토리 목록')로 변경하였습니다.
🎯 Why (해결된 사용자 문제): 문서 언어가 lang="ko"로 설정되어 있음에도 영문 ARIA 라벨이 사용되어, 스크린 리더가 올바르지 않은 발음으로 읽는 접근성 문제가 있었습니다.
📸 Before/After: 해당 사항 없음 (시각적 변경 없음)
♿ Accessibility (개선된 접근성): 스크린 리더(Screen Reader) 사용자가 문서의 언어와 일치하는 정확한 맥락(디렉토리 목록)을 제공받을 수 있도록 개선되었습니다.

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PR created automatically by Jules for task 6208908944088994923 started by @seonghobae

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